Update...turned out I had accumulated points with the cell phone company were currently using and could use those points to add USA cell coverage for the entire time we were away.
I have to say, our trip to Nevada, Arizona, and Utah was one of the best trips we have ever taken. Every person we met from clerks in stores, gas stations, restaurant, hotels, airports, and all the people we encountered along our travels everyone was friendly and helpful. And of course we fell in love with Arizona, wow what an amazing place!.